Fluid pressure gauge



Dec. 12, 1933. Rgopp 1,939,466

FLUID PRESSURE GAUGE Filed July 6, 1931 y WA vi we 14195.

Patented Dec. 12, 1933 FLUID PRESSURE GAUGE George Frederick. Ruopp, Marshalltown, Iowa,

assignor to Marshalltown Manufacturing Company, Marshalltown, Iowa, a corporation of UNITED STA Application July6,-1931. Serial No. 548,766

3 Claims. (01. {73'109)' solder to hold the two parts of the lever against further movement, as indicated at 13 in Figure 7. Mounted within the frame 13 is an upright shaft 19 having mounted on'its upper end the indicator arm 20, and at the lower end of the shaft 19 is a convolute spring 21 for normally holding the indicator arm toward its low pressure position.

Fixed to the shaft 19 is an arm 22 and pivoted to this arm 22 is a link 23 formed witha slot 24 and extended through this slotis a. screw 25 seated in the outer end of the lever 16.

Pivotally connected to the lever 14 near its pivot point is another link' 26 formed with a slot 27. A screw 28 extends through this slot and is seated in the free end of the Bourdon tube. This screw is preferably provided with a shoulder at 29, as shown in Figure 6, which limpointed out in my claims, and illustrated in the its the movement of the screw into the Bourdon accompanying drawing, in which: tube 12, so that the link 26 is free to slide relative Figure 1 shows a front elevation of a pressure to the Bourdon tube through the length of the gauge embodying my invention. slot 27. The screw 25 is similarly constructed, so Figure 2 shows a side elevation of same. that there is nobinding of the screws 25 and 28 Figure 3 shows a front elevation of same with upon their respective links 23 and 26. the dial removed to show the operating mecha-' A stop device 30 is secured to the casing and his l V extended to position to engage the lever 16 and Figure 4 shows a central sectional view of the limit its movement in one direction. gauge frame to show the interior construction, In practical use, and assuming that relatively taken on the line 4-4 of Figure 3. 1 high hydraulic pressures are applied to the Bour- Figure 5 shows a sectional view on the line don tube, and that these pressures vary at con- 55 of Figure 3. r siderable rapidity, then during the expanding Figure 6 shows a sectional view movement of the Bourdon tube, motion is trans- 6-6 of Figure 3; and mitted to the lever 16 by'the'link 26, and from Figure 7 shows a sectional view the lever 16 by the link 23 to the arm 22, which 7-7 of Figure 3. v operatesthe indicator arm. When, however, the Referring to the accompanying drawing, I Bourdon tube vibrates in the opposite direction. have used the reference numeral 10 to indicate the'screw 28 slides through theslot 2'7, and likegenerally the gauge casing having a pipe 11 in wise the screw 25 slides through the slot 24 withits lower end, through which the fluid pressure out affecting the indicator arm, which is moved for operating the gauge is introduced. in the direction toward the low pressure side of On the interior of the gauge is a Bourdon the instrument only by the spring 21. tube 12 communicating with the pipe 11. This By'this means the excessive shocks and jars, to Bourdon tube is intended foruse in connection which the indicator arm and its associated parts with liquids or air under relatively high preswould ordinarily be subjected by the rapid vibratsures, and it is, therefore, made'relatively large ing movement of the Bourdon tube, are substan-' and sturdy in' construction, and its free end is tially eliminated as applied to the indicator arm moved a relatively slight distance on account of and its associated parts, and hence the gauge is the differences in pressure. relatively long lived and not subjected torapid Mounted within the casing 10 is a frame 13 to breaking down or Wearing out on account of such which there is pivoted a lever 14 containing a excessive vibration. slot 15. This lever is provided with an extension By forming the lever 14 and 16 of two parts member 16 adjustably connected with the memadjustably connected, the operator may adjust ber 14 by screws 1''! through the slot 15, and by the length of the lever by the set screws 17 until this means the length of the lever may be adthe indicator arm correctly indicates the pres justed and when so adjusted I preferably apply sures in correspondence with the scale marked 110 My invention relates to that class of pressure gauges which employs the Bourdonv tube, and is particularly designed for use in connection with relatively high pressure gauges which are subjected to rapid pressure changes. p My object is to provide a gauge of this char-1 acter in which the Bourdon tubeis relatively large and sturdy in construction to withstand high pressure, and to provide means for minimizing the effect of rapid vibrations of the Bourdon tube as applied to the indicating arm and associated parts, to thereby prevent such vibration from injuring or rapidly breaking down the indicator arm and its associated parts.

My invention consists in the construction, arrangement and combination ofthe various parts of the device, whereby the objects contemplated. are attained, as hereinafter more fully set forth,

on the line on the line upon the gauge, and when this point has been reached, the screws 17 are set and solder is applied to the screws and the overlapping members of the lever, thus permanently fixing these parts in their correctly adjusted position and preventing vibration applied to the lever from affecting this adjustment.

Furthermore, by having the lever 14 and 16 of relatively great length and by connecting the link 1. A pressure gauge comprising a Bourdon tube,

an indicator arm and means for transmitting motion to the indicator arm, said means comprising a shaft for the indicator arm, a lever,-a link pivvoted to 'the' lever near its fulcrumand pivoted to g the Bourdon tube, saidlink having a limited sliding movement at one end whereby contracting.

movements of the Bourdon tube will not be transmitted to the lever, means for connecting the lever .to the indicator arm, comprising a link having a limited sliding connection at one end, and a spring for normally holding the indicator arm toward its low pressure position, said lever being formed of two parts adjustably clamped together.

2. A pressure gauge comprising a Bourdon tube, a rotatable shaft, an indicator arm fixed to the rotatable shaft, a spring for normally holding the shaft and indicator arm toward the low pressure side of the gauge, an arm fixed to the indicator shaft, a link pivoted to said arm and having-a slot at its other end, a lever pivoted within the gauge, a screw extended through said slot and seated in the outer end of said lever arranged to permit free movement of the lever relative to the link, a second link pivoted to said lever near its fulcrum point and formed with a slot at its outer end, a screw extended through said slot "and connected to the Bourdon tube, said lever being adjustable in length, substantially, as and for the purposes stated.

3. A pressure gauge comprising a Bourdon tube, a rotatable shaft, an indicator fixed to said shaft, an arm fixed to said shaft, a lever, a link connecting the lever to the Bourdon tube, and a second'link connecting the lever to said arm, said connections between the indicator shaft and the Bourdon tube including means whereby expanding movements of the Bourdon tube will be transmitted to the indicator shaft and contracting movements of the Bourdon tube Will not be transmitted to the shaft, and a spring normally tending to return the indicator toits zero position.

GEORGE FREDERICK RUOPP. 

